Is there a service for calculating the route by public transport for a courier, or write your own?

Question

Google Maps

Good afternoon!
It is necessary to automate the work of the courier service. There are 20+ couriers who deliver goods by public transport. Is there a suitable service for choosing the best route by PUBLIC transport? Or write your own? Maybe there are alternative solutions?

Answer 1

https://maxoptra.ru/ has such functionality.